Variable temperature in a BEAM in Altair OptiStruct Posted March 11 · Report reply On 3/6/2020 at 10:30 PM, Simon Križnik said: Yes, according to Learn Thermal Analysis with Altair OptiStruct ebook: Attached is an example from the ebook which I modified to include multiple heat sources (ambient & local). Note: The ambient temperature is applied with convection on the outer surface. The local temperature is imposed at one end of the tube. This approach is valid for 3D elements, but not for 1D beams. Pipe_One_Step_Transient_multiple.fem 2.63 MB · 1 download And is there any way of doing it with 1D beams?